“BIG DAY today…excited. doing something new,” he
target="_blank">tweeted last Friday. Later, he revealed that he had spent the day on the “CSI” set, where he shot his scenes for the hit CBS crime drama. “CSI premieres on Thursday, Sept 23rd on CBS … and I told you I was a BAD MAN!!” he posted.

In addition to using his Twitter account to share a few behind-the-scenes photos from his time on the show, he tweeted a big thanks to the “CSI” cast and crew. “Amazing day … excited for you guys to get to watch it … and yes i did prank the EP of the show … somebody got locked in the closet. ;)” he shared. “Thanks to everyone at CSI for having me.”

The pop star will play Jason McCann, a “troubled teen who is faced with a terrible decision regarding his only brother — a decision that leads him into an explosive confrontation with the CSIs,” CBS told
target="_blank">E! Online. CBS also noted that Bieber’s arc would conclude later in the season.